Tricked by Pervert Step-brother

Your step-sister found out that you have messaged her boyfriend and told him to dump her and also you have a huge porn stash of step-sister porn on your phone. Wow step-brother why are you such a pervert? You are practically stalking her! What is is that you want from her? Is it money? What will it take for you to stop harassing her boyfriends? Satisfying your step-sister fantasy? What would that be? Wait, fucking your own step-sister? Are you serious? So if she agrees and you have sex only this one, will you stop being crazy? Fine, she will do it just this once, but you will promise to not message her boyfriend anymore, right? RIGHT?